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Obviously me readers digest version doesnt cover everything that happens in a system, however, what we have here is a guy who needs help. This is typicaly of many newbies when they see automation, just like when a rooftop guy sees his first chiller. We need to get him to realize its just a system, and try to focus on what is the real issue. most likely it is an errant setpoint, he just needs to find the right one. it could also be a sensor failure, but that should be a really wacky value, causing him to see something unusual. ie, it is clearly not -40 degrees in the duct. to me, the first thing that needs to happen is a calming effect, then the real work can begin.

looks like you got simplicity elite I think in your unit. You will need to verify settings either in the front end or at the rooftop. here is a copy of a simplicity elite for smaller units, I cannot find the one for your unit, but this will give you an ide. read it carefully, as it doesnt take much to eff it up.